your on the right track here.
nice pictures to ...
to me
Its clearly visible that on the LW case there is a layer over the metal surface .
so it is not a acid /chemical oxidation process that collared the metal black .
the thickness is so thin a paint would not be the first I would think of,,
More a Heating /oil based evaporation could be what we are looking at ..
not so fore the "blued" collared cores .
thickness of the blueish surface layer speaking against it .
For me ,,that thickness speaks more of a paint then anything else .
Still hard to judge
regards kay
nice pictures to ...
to me
Its clearly visible that on the LW case there is a layer over the metal surface .
so it is not a acid /chemical oxidation process that collared the metal black .
the thickness is so thin a paint would not be the first I would think of,,
More a Heating /oil based evaporation could be what we are looking at ..
not so fore the "blued" collared cores .
thickness of the blueish surface layer speaking against it .
For me ,,that thickness speaks more of a paint then anything else .
Still hard to judge
regards kay
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